Kos weather in September 2025

Expect 28°C daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Kos in September. Check more long-term weather averages for Kos in September before you book your next holiday to Kos in 2025/2026.

  • 28°C maximum daytime temperature in September in Kos (Kos Town)28
    28°C max day temperature
  • 11 hours of sunshine per day
  • 5 days with some rainfall in September in Kos (Kos Town)5
    5 days with some rainfall
  • 19°C minimum night-time temperature in September in Kos (Kos Town)19
    19°C min night temperature
  • 12 hours of daylight per day in September in Kos (Kos Town)12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Kos (Kos Town)M
    Moderate heat & humidity
  • 17 mm monthly rainfall in September in Kos (Kos Town)17
    17 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Kos (Kos Town)7
    7 (High) UV index
  • 24°C sea temperature in September in Kos (Kos Town)24
    24°C sea temperature

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The September weather guide for Kos (Kos Town) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Kos destinations

Below are average maximum temperatures at popular countries, regions and places in Kos in September. Select a holiday destination to see more weather parameters.

All Kos destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Kos in September?

Daytime temperatures usually reach 28°C in Kos Town, Kos in September with moderate heat and humidity, falling to 19°C at night.

How sunny is it in Kos in September?

There are normally 11 hours of bright sunshine each day in Kos Town, Kos in September - that's 90% of daylight hours.

How warm is the sea around Kos in September?

The average sea temperature around Kos Town, Kos in September is 24°C.

Does it rain in Kos in September?

There are usually 5 days with some rain in Kos Town, Kos in September and the average monthly rainfall is 17mm.

Kos September sunrise & sunset times

Browse the sunrise and sunset times for Kos in September 2025. Select a month to view Kos sunrise and sunset times for the next 12 months. The Kos sunrise and sunset times shown below are for Kos Town.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:42 18:39
Monday, 15th September 2025 05:53 18:18
Tuesday, 30th September 2025 06:05 17:56

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